Bargle is innocent.
Patrons in the tavern at Threshold heard Aleena ask Bargle to help her and Huxley in the abandoned caves. The two left together, and Huxley followed nearby when he saw them leave together.
On their way to the caves, Aleena hinted that there was only enough treasure for two of them, and suggested perhaps Huxley should meet with an "accident" in the caves so she and Bargle could split the treasure.
Her plan, however, was to have Huxley ambush Bargle and slay him with her help, then she would kill Huxley to keep the treasure for herself. But when Huxley over heard she was planning to double-cross him, he rushed ahead to the caves prepared to slay them both.
Bargle suspected a trap, however, and left Aleena, returning to the town. Aleena continued to the abandoned caves to tell Huxley the plan was off. Huxley ambushed her instead and killed her, then returned to Threshold, claiming he saw Barlge kill her!
However, when Barlge was arrested, there was no treasure found! Where is the treasure? Whoever has the treasure is guilty!
And so we present evidence for the defense: in Huxley's depiction, he clearly recovered the treasure himself, so is really the quilty party!